湿位涡方程及其应用

本文在湿绝热、无摩擦条件下，推导了湿位涡方程及其近似表达式。然后通过尺度分析得到了大尺度条件下湿位涡守恒的性质，其形式与干位涡一样。由于考虑了水汽的作用，使用它较干位涡更为方便。最后，我们把湿位涡用于江南岭北3 月有无连阴雨的分析，其结果与预报员经验是一致的。

The Wet Potential Vorticity Equation and its Application

The wet potential vofticity equation and its approximate form are deduced on the conditions of wet adiabatic and frictionless. The characteristics of conservation of wet potential vorticity of large scale weather systems are obtained by means of the scale analysis. The conservation of wet potential vorticity is similar to that of dry potential vorticity. The wet potential vorticity includes the effects of water vapor. Therefore it is used more conveniently than the dry potential vorticity. Finally, the wet isentropic potential vorticity is applied in the analyses of the continuously rainy and fine weather in March in the area south to the Yangtze River and north to Naming Mountains. The results are consistent with the experience of forecasters.